Deformation in response to landscape evolution during glacial cycles on the U.S. Atlantic passive margin

Gregory Ruetenik*, Robert Moucha, Bas de Boer

*Corresponding author for this work

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

Elevations of Pleistocene highstand formations that lie across the South Carolina and northern Georgia coastal plain lie well above those of reconstructed past sea levels. This discrepancy has been attributed to some combination of tectonics, glacial isostatic adjustment, and/or deviations in estimated ocean volumes derived from the marine δ18O record. To reconcile these anomalous elevations, we combine a landscape evolution model with models of coupled ice sheet, sea level and solid Earth deformation along the southern U.S. Atlantic passive margin to estimate erosion, deposition and corresponding isostatic response since Marine Isotope Stage (MIS) 11 (∼410 ka). We find that along-shore changes in modeled paleo-shoreline elevations are similar to measured elevations along 100s of kilometers. Up to 10 m of shoreline uplift since MIS 11 may be attributed to isostatic feedback in response to sediment redistribution.

Original languageEnglish
Article number115759
Pages (from-to)1-9
Number of pages9
JournalEarth and Planetary Science Letters
Volume526
Early online date4 Sep 2019
DOIs
Publication statusPublished - 15 Nov 2019

Keywords

  • geodynamics
  • surface processes
  • coastal processes
  • sea level

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